Linux

tinystdio: fix __bufio_flush_locked with BUFSIZ == 0 #19

Job	Run time
cache-maker	9m 29s
cmake-linux (./.github/do-cmake-linux -DCMAKE_BUILD_TYPE=RelWithDebInfo)	10m 14s
minsize-linux (./.github/do-linux)	34m 57s
cmake-linux (./.github/do-cmake-linux -DCMAKE_BUILD_TYPE=MinSizeRel)	9m 25s
release-linux (./.github/do-linux)	25m 20s
minsize-linux (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=tr...	34m 58s
cmake-linux (-D__IO_FLOAT=y -D_IO_FLOAT_EXACT=n -D_WANT_IO_LONG_LONG=y -D_MB_CAPABLE=y -D_WANT_IO...	9m 57s
release-linux (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=tr...	25m 55s
minsize-linux (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-ma...	34m 36s
cmake-linux (-D__IO_FLOAT=y -D_IO_FLOAT_EXACT=n -D_WANT_IO_LONG_LONG=y -D_MB_CAPABLE=y -D_WANT_IO...	9m 44s
release-linux (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-ma...	35m 26s
minsize-linux (-Dtinystdio=false, ./.github/do-linux)	34m 56s
release-linux (-Dtinystdio=false, ./.github/do-linux)	25m 51s
minsize-linux (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=true...	34m 54s
release-linux (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=true...	25m 25s
	6h 1m 7s

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